A device for testing the protective performance of rubber-plastic pipes

Abstract

The application relates to the field of rubber and plastic pipe testing, in particular to a rubber and plastic pipe protection performance testing device. In the process of production, the existing rubber and plastic pipe is usually stretched along the axis by linear motion for the detection of the tensile property, and the step-by-step pushing mode leads to the fact that the rubber and plastic pipe is usually stretched with a large amplitude, and the rubber and plastic pipe is broken during the stretching process. The rubber and plastic pipe protection performance testing device is provided with the first arc surface to the third arc surface with a decreasing arc rate, corresponding to the gradient change in the stretching process, the large arc rate displacement of the first arc surface is matched in the initial stage, and the precise control of the third arc surface is switched in the yield stage, the arc surface gradually changes and advances, the rubber and plastic pipe to be detected is stressed more continuously, and the stress step phenomenon of the traditional step-by-step stretching is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rubber and plastic pipe testing, in particular to a rubber and plastic pipe protection performance testing device. BACKGROUND

[0002] The rubber and plastic pipe is a tubular material made of rubber and plastic, which forms a closed cell structure through a specific foaming extrusion process, and has the flexibility of rubber and the durability of plastic. The tensile rate (elongation at break) is one of the core indicators in the performance testing of the rubber and plastic pipe. The tensile rate directly reflects the flexibility and plastic deformation capacity of the material. Low tensile rate indicates the risk of brittleness, and the pipe is prone to breakage during bending. Batch tensile rate testing is used to monitor production stability and ensure the consistency of performance of different batches of products.

[0003] The existing technology has the following problems which have not been well solved: In the process of detecting the tensile performance of the existing rubber and plastic pipe, the rubber and plastic pipe is usually stretched along its axis by straight line motion. The step-by-step pushing method causes the rubber and plastic pipe to stretch easily with a large amplitude, resulting in rupture of the rubber and plastic pipe during stretching.

[0004] During the tensile testing of the rubber and plastic pipe, different lengths of each pipe in the same batch need to be tested. The existing performance testing of the rubber and plastic pipe cannot effectively monitor the maximum tensile value during the tensile process of the rubber and plastic pipe. The maximum value range during the tensile process of the rubber and plastic pipe cannot be determined, which affects the judgment and improvement in the production process. SUMMARY

[0005] The present application aims to provide a rubber and plastic pipe protection performance testing device to solve the problems in the background art. To achieve the above-mentioned purpose, the present application provides the following technical solution: a rubber and plastic pipe protection performance testing device, comprising a test table, a lead screw sliding table is arranged on the top of the test table, a tensile testing device is arranged on the sliding table of the lead screw sliding table, load-bearing tables for placing rubber and plastic pipes are arranged at equal intervals on the top of the test table, and an elastic rebound device for testing the tensile rubber and plastic pipe is arranged in each load-bearing table.

[0006] Preferably, the tensile testing device comprises a mounting frame fixedly connected to the sliding table, a rotary motor is arranged in the mounting frame, a cam is connected to the main shaft of the rotary motor, a moving plate for moving the initial value of the length of the stretched rubber and plastic pipe is slidingly connected to the mounting frame, a jacking rod is vertically connected to the moving plate, the jacking rod and the moving plate form a rotary pair and a moving pair, a connecting spring is sleeved on the jacking rod, and the two ends of the connecting spring are connected to the jacking rod and the bottom of the moving plate, respectively.

[0007] Preferably, the surface of the cam is provided with two oppositely arranged grooves, and the two grooves form an X-shaped connecting groove on the concave surface of the cam; the bottom of the jacking rod is provided with a V-shaped clamping block extending into the groove; and the moving plate is further slidably connected with a test piece in abutting cooperation with the elastic rebound device.

[0008] Preferably, the mounting frame is further provided with an adjusting device for adjusting the length of the test piece, the adjusting device comprising an adjusting toothed plate slidably connected to the side wall of the mounting frame, a limiting rod fixedly connected to the adjusting toothed plate, the limiting rod being slidably connected to the mounting frame, a compression spring sleeved on the limiting rod, and the two ends of the compression spring being connected to the mounting frame and the adjusting toothed plate respectively, a spherical cavity being formed in the side wall of the adjusting toothed plate, and a jacking ball being arranged on the top of the jacking rod corresponding to the spherical cavity.

[0009] Preferably, a rotating shaft is rotatably connected to the side wall of the mounting frame, an adjusting gear is axially connected to the rotating shaft, a one-way bearing is arranged in the adjusting gear, the adjusting toothed plate is in meshing cooperation with the adjusting gear, an intermittent rotating frame is fixedly connected to the rotating shaft, a rotating shaft is rotatably connected to the mounting frame, an intermittent turntable is axially connected to the rotating shaft, an intermittent groove is formed in the intermittent turntable, and the intermittent rotating frame is in transmission cooperation with the intermittent groove of the intermittent turntable.

[0010] Preferably, the end of the rotating shaft away from the intermittent turntable is fixedly connected with an adjusting sleeve, an initial flat end, a first arc surface, a second arc surface and a third arc surface are equally divided around the circumference of the end face of the adjusting sleeve, the arc rates of the first arc surface, the second arc surface and the third arc surface are equal ratio reduced in turn, an adjusting frame is slidably connected to the mounting frame, a pulley is rotatably arranged on the adjusting frame, the pulley is in abutting cooperation with the end face of the adjusting sleeve, a positioning rod is fixedly connected to the adjusting frame, the positioning rod is slidably connected to the mounting frame, and a compression spring is sleeved on the positioning rod, the two ends of the compression spring being connected to the adjusting frame and the mounting frame respectively.

[0011] Preferably, the test piece comprises a sliding rod slidably connected to the end of the moving plate, arc-shaped inclined pieces are equidistantly arranged on the outer wall of the sliding rod along the axis of the sliding rod, a limiting pawl is rotatably connected to the bottom of the moving plate, and a spring sheet is connected between the limiting pawl and the moving plate, the end of the sliding rod is in abutting cooperation with the elastic rebound device, an adjusting pawl is rotatably connected to the adjusting frame, a torsion spring is arranged between the adjusting pawl and the adjusting frame, the adjusting pawl is oppositely arranged with the limiting pawl, and the adjusting pawl is in abutting cooperation with the arc-shaped inclined pieces.

[0012] Preferably, the plurality of elastic rebound devices each comprise a bearing frame fixedly connected to the bearing table, the bearing frame is provided with a notch, a clamping disc is arranged at the notch of the bearing frame, and a movable clamping frame is slidably connected to the notch of the bearing frame, the movable clamping frame is provided with a locking disc for clamping the rubber and plastic pipe, and the movable clamping frame abuts against the end of the sliding rod.

[0013] Preferably, a detection frame is further slidably connected to the bearing frame, an elastic spring is arranged between the detection frame and the bearing frame, a wedge-shaped abutting block is slidably connected to the detection frame, one side end face of the locking disc is inclined and abuts against the wedge-shaped abutting block, and a notch is arranged on the detection frame and abuts against the side of the locking disc away from the inclined surface.

[0014] In the present application, the distance of each reciprocating movement of the moving plate is the same, and when the rubber and plastic pipes on each bearing table are subjected to tensile test, the initial value of the moving plate moving to drive the test piece is consistent, so that the distance of each rubber and plastic pipe during the tensile test can be ensured to be the same, thereby improving the consistency of the initial value during the performance test of each rubber and plastic pipe during the tensile test of the rubber and plastic pipe.

[0015] In the present application, the end face of the adjusting frame is composed of a first arc face, a second arc face and a third arc face, and when the rotating shaft drives the adjusting sleeve to slowly rotate, the first arc face is used to slowly move the adjusting frame, the position of the adjusting frame is changed in the form of arc face, and compared with linear motion, arc sliding is stronger in vibration resistance and anti-interference, is suitable for low-speed adjusting position scenes in the detection process, and makes the rubber and plastic pipe tend to be stable during the performance detection process and gradually stretched in the slow movement process.

[0016] In the present application, the arc rates of the first arc face, the second arc face and the third arc face are sequentially and proportionally reduced, the first arc face to the third arc face with decreasing arc rate correspond to the gradient change in the stretching process, the adjusting sleeve is rotated by 90 degrees, the large arc rate displacement of the first arc face is matched in the initial stage, and the precise control of the third arc face is switched in the yield stage, the gradual change of the arc face promotes the force of the rubber and plastic pipe to be detected to be more continuous, reduces the stress step phenomenon of the traditional step-by-step stretching, and reduces the risk of premature rupture of the rubber and plastic pipe caused by stress concentration.

[0017] In the present application, the rubber and plastic pipes on the bearing table are sequentially stretched and detected, and the next group of rubber and plastic pipes is slowly rotated in the stretching process on the basis of the last time, so that the morphological change of the rubber and plastic pipe at the stretching limit can be more clearly and intuitively observed, and the detection of the performance of the rubber and plastic pipe can be more stable. In the present application, the distance of the detection frame reset sliding can be used to judge whether the resilience rate of the rubber and plastic pipe can reach the standard value, i.e. less than or equal to 15%, so as to test the resilience performance of the rubber and plastic pipe during the resetting process. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a partial three-dimensional structural diagram of the present invention. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of a partial three-dimensional structure in the present invention. Figure 2 ;

[0021] Figure 4 The state of the regulating device in this invention Figure 1 ;

[0022] Figure 2 The state of the regulating device in this invention Figure 6 ;

[0023] Figure 7 This is a partial three-dimensional structural diagram of the adjustment device in this invention;

[0024] Figure 3 This is a schematic diagram of a partial three-dimensional structure in the present invention. Figure 8 ;

[0025] Figure 9 This is a three-dimensional structural diagram of the adjusting device and the elastic rebound device in this invention;

[0026] Figure 1 This is a partial three-dimensional structural diagram of the adjustment device in this invention. Figure 10 ;

[0027] Figure 2 This is a partial three-dimensional structural diagram of the adjustment device in this invention. Figure 11 ;

[0028] Figure 12 This is a three-dimensional structural diagram of the adjustment device and test piece in this invention;

[0029] Figure 13 This is a three-dimensional structural diagram of the elastic rebound device in this invention;

[0030] Figures 1 to 13 This is a three-dimensional cross-sectional view of the elastic rebound device in this invention.

[0031] In the figure: 1, test bench; 11, screw slide; 12, slide; 13, bearing table; 2, tensile test device; 21, mounting frame; 22, rotary motor; 23, cam; 24, moving plate; 25, lifting rod; 26, connecting spring; 27, groove; 28, connecting groove; 29, clamping block; 3, adjusting device; 31, adjusting tooth plate; 32, limit rod; 33, return spring; 34, ball cavity; 35, lifting ball; 36, rotating shaft; 37, adjusting gear; 38, intermittent rotating frame; 39, rotating shaft; 310, intermittent turntable; 311, intermittent groove; 312, adjusting sleeve; 313, initial flat end; 314, first arc surface; 315, second arc surface; 316, third arc surface; 317, adjusting frame; 318, pulley; 319, positioning rod; 320, compression spring; 4, test piece; 41, sliding rod; 42, arc-shaped inclined piece; 43, limit pawl; 44, spring piece; 45, adjusting pawl; 5, elastic rebound device; 51, bearing frame; 52, notch; 53, clamping disc; 54, moving clamping frame; 55, locking disc; 56, detection frame; 57, elastic spring; 58, wedge-shaped stopper. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Please refer to Figures 1 to 13 The present application provides a technical solution: a kind of rubber plastic pipe protection performance test device, including test bench 1, the top of the test bench 1 is equipped with screw slide 11, the slide 12 of the screw slide 11 is equipped with tensile test device 2, the top of the test bench 1 is equipped with bearing table 13 for placing rubber plastic pipe at equal intervals, and each bearing table 13 is provided with elastic rebound device 5 for testing the elasticity of rubber plastic pipe after stretching.

[0034] In the embodiment, the tensile test device 2 includes a mounting frame 21 fixedly connected to the slide 12, the mounting frame 21 is provided with a rotary motor 22 inside, the main shaft of the rotary motor 22 is connected with a cam 23, the mounting frame 21 is slidably connected with a moving plate 24 for stretching the initial value of the moving length of the rubber plastic pipe, the moving plate 24 is connected vertically with a lifting rod 25, the lifting rod 25 and the moving plate 24 form a rotating pair and a moving pair, the lifting rod 25 is sleeved with a connecting spring 26, and the two ends of the connecting spring 26 are connected with the bottom of the lifting rod 25 and the moving plate 24 respectively;

[0035] The surface of the cam 23 is provided with two oppositely arranged grooves 27, and the two grooves 27 form an X-shaped connecting groove 28 on the concave surface of the cam 23. The bottom of the lifting rod 25 is provided with a V-shaped clamping block 29 extending into the groove 27. The moving plate 24 is further connected with the test piece 4 in abutting cooperation with the elastic rebound device 5.

[0036] The rotating motor 22 drives the cam 23 to rotate. During the rotation of the cam 23, the clamping block 29 at the bottom of the lifting rod 25 slides in the groove 27. When the cam 23 rotates to the connecting groove 28 on the concave surface, the lifting rod 25 is limited in the connecting groove 28, so that the clamping block 29 is deflected in the connecting groove 28 and moves into the other groove 27, so that the clamping block 29 can move from one groove 27 to the other groove 27. The lifting rod 25 is movably connected to the moving plate 24, so that the moving plate 24 can slide on the mounting frame 21. The rotation of the cam 23 drives the lifting rod 25 to make the moving plate 24 reciprocate. The distance of each reciprocation of the moving plate 24 is the same. When the rubber and plastic pipes on each bearing table 13 are tested, the initial value of the test piece 4 is consistent, so that the distance of each rubber and plastic pipe during the test is the same, thereby improving the initial value of each rubber and plastic pipe during the performance test.

[0037] In this embodiment, the mounting frame 21 is further provided with an adjusting device 3 for adjusting the length of the test piece 4. The adjusting device 3 includes an adjusting tooth plate 31 slidably connected to the side wall of the mounting frame 21. The adjusting tooth plate 31 is fixedly connected with a limiting rod 32. The limiting rod 32 is slidably connected to the mounting frame 21. The limiting rod 32 is sleeved with a reset spring 33. The two ends of the reset spring 33 are connected to the mounting frame 21 and the adjusting tooth plate 31, respectively. A spherical clamping cavity 34 is formed in the side wall of the adjusting tooth plate 31. The top of the lifting rod 25 is provided with a lifting ball 35 corresponding to the spherical clamping cavity 34.

[0038] A rotating shaft 36 is rotatably connected to the side wall of the mounting frame 21. An adjusting gear 37 is rotatably connected to the rotating shaft 36. A one-way bearing is arranged in the adjusting gear 37. The adjusting tooth plate 31 is engaged with the adjusting gear 37. An intermittent rotating frame 38 is fixedly connected to the rotating shaft 36. A rotating shaft 39 is rotatably connected to the mounting frame 21. An intermittent turntable 310 is rotatably connected to the rotating shaft 39. An intermittent groove 311 is formed in the intermittent turntable 310. The intermittent rotating frame 38 is in transmission cooperation with the intermittent groove 311 on the intermittent turntable 310.

[0039] The rotating shaft 39 is fixedly connected with an adjusting sleeve 312 at one end away from the intermittent rotating disc 310, an initial flat end 313, a first arc surface 314, a second arc surface 315 and a third arc surface 316 are arranged on the end face of the adjusting sleeve 312 at equal intervals along the circumference of the end face, the arc rates of the first arc surface 314, the second arc surface 315 and the third arc surface 316 are reduced in equal ratio successively, the mounting frame 21 is slidably connected with an adjusting frame 317, a pulley 318 is rotatably arranged on the adjusting frame 317, the pulley 318 is in abutment with the end face of the adjusting sleeve 312, a positioning rod 319 is fixedly connected to the adjusting frame 317, the positioning rod 319 is slidably connected with the mounting frame 21, a compression spring 320 is sleeved on the positioning rod 319, and the two ends of the compression spring 320 are connected with the adjusting frame 317 and the mounting frame 21 respectively;

[0040] The test piece 4 comprises a sliding rod 41 slidably connected to the end of the moving plate 24, arc-shaped inclined pieces 42 are arranged on the outer wall of the sliding rod 41 at equal intervals along the axis of the sliding rod 41, a limiting pawl 43 is rotatably connected to the bottom of the moving plate 24, and a spring piece 44 is connected between the limiting pawl 43 and the moving plate 24, the end of the sliding rod 41 is in abutment and cooperation with the elastic rebound device 5, an adjusting pawl 45 is rotatably connected to the adjusting frame 317, a torsion spring is arranged between the adjusting pawl 45 and the adjusting frame 317, the adjusting pawl 45 is arranged opposite to the limiting pawl 43, and the adjusting pawl 45 is in abutment with the arc-shaped inclined pieces 42;

[0041] When the rubber and plastic tube is stretched, the cam 23 rotates through the groove 27 to move the lifting rod 25 and the moving plate 24 towards the adjusting tooth plate 31, at this time, the lifting ball 35 on the lifting rod 25 corresponds to the spherical cavity 34 on the adjusting tooth plate 31, with the rotation of the cam 23, the convex end of the cam 23 will lift the lifting rod 25 upwards, and the lifting ball 35 will drive the adjusting tooth plate 31 to move upwards, when the adjusting tooth plate 31 moves upwards, the adjusting gear 37 is driven to rotate the rotating shaft 36 by one revolution, the rotating shaft 36 drives the intermittent rotating frame 38 to rotate by one revolution, and the intermittent rotating frame 38 drives the intermittent disc 310 to rotate by 90 degrees through the intermittent groove 311 on the intermittent disc 310, the rotating shaft 39 on the intermittent disc 310 drives the adjusting sleeve 312 to rotate by 90 degrees, and the pulley 318 on the initial flat end 313 of the adjusting sleeve 312 is driven by the compression spring 320 to move the adjusting frame 317 along the end surface of the adjusting sleeve 312, at this time, the pulley 318 moves from the initial flat end 313 to the first arc surface 314, the pulley 318 is located at the junction of the first arc surface 314 and the second arc surface 315 after the adjusting sleeve 312 rotates by 90 degrees, and the pulley 318 drives the adjusting frame 317 to move forward under the action of the first arc surface 314, when the adjusting frame 317 moves, the adjusting pawl 45 on the adjusting frame 317 contacts the gap between the arc-shaped inclined plates 42, so that the sliding rod 41 moves towards the elastic rebound device 5, and the end of the sliding rod 41 is connected with the rubber and plastic tube on the elastic rebound device 5, so as to stretch the rubber and plastic tube on the elastic rebound device 5, when the pulley 318 falls from the first arc surface 314 to the second arc surface 315, the adjusting frame 317 drives the adjusting pawl 45 to slide on the inclined surface of the arc-shaped inclined plate 42, and the displacement of the moved sliding rod 41 is not caused, and the limiting pawl 43 arranged below the adjusting pawl 45 is clamped between the two arc-shaped inclined plates 42 to limit the position of the sliding rod 41 on the moving plate 24, so that the position of the sliding rod 41 is stable;

[0042] The end surface of the adjusting frame 317 is composed of the first arc surface 314, the second arc surface 315 and the third arc surface 316, when the rotating shaft 39 drives the adjusting sleeve 312 to rotate slowly, the first arc surface 314 is used to slowly move the adjusting frame 317, the position of the adjusting frame 317 is changed in the arc surface mode, and the arc sliding is stronger in vibration resistance and anti-interference than linear motion, and is suitable for low-speed adjusting position scenes in the detection process, so that the rubber and plastic tube tends to be stable in the performance detection process, and the rubber and plastic tube is stretched gradually in the slow movement process;

[0043] When one of the rubber plastic pipe tensile test, at this time the motor 22 driven cam 23 rotation, cam 23 will drive the jacking rod 25 down, jacking rod 25 down when the adjustment tooth plate 31 reset, the adjustment gear 37 is provided with one-way shaft and will not make the rotating shaft 36 rotation, rotating shaft 36 on the intermittent rotation frame 38 stay in the last group of rotation position, at this time the motor 22 driven cam 23 rotation reset, the moving plate 24 reset to the initial endpoint position, through the screw slide 11 will be moved to the next set of test device 2 on the side of the bearing table 13 to carry out the next group of test;

[0044] At this time the cam 23 rotation again will move forward the moving plate 24, the sliding rod 41 on the moving plate 24 is moved on the basis of the last group of tensile test, the sliding rod 41 and the corresponding elastic rebound device 5 abuts after driving the rubber plastic pipe to stretch, when the jacking rod 25 again to move up the adjustment tooth plate 31, the adjustment tooth plate 31 up makes the rotating shaft 39 rotate 90 degrees again, the pulley 318 on the second arc surface 315 of the adjusting sleeve 312 will continue to move along the second arc surface 315, at this time the adjusting frame 317 moves through the bottom of the adjusting pawl 45 drive sliding rod 41 forward, then will be on the basis of the last time to stretch the distance to extend, the rubber plastic pipe after the first arc surface 314 stretch is in the stable state and does not appear damage, through the direct extension in the safe moving distance, can shorten the time of the rubber plastic pipe detection;

[0045] The first arc surface 314, the second arc surface 315 and the third arc surface 316 are equal proportionally reduced between each other, the first arc surface 314 to the third arc surface 316 of the arc rate decreases, corresponding to the gradient change in the stretching process, the adjusting sleeve 312 is rotated 90 degrees, the initial stage matches the large arc rate displacement of the first arc surface 314, and the yield stage is switched to the precise control of the third arc surface 316. The arc surface gradually changes to make the rubber plastic pipe to be detected more continuous in stress, reduce the stress step phenomenon of traditional step by step stretching, and reduce the risk of premature rupture of rubber plastic pipe caused by stress concentration;

[0046] The rubber plastic pipe on the bearing table 13 is stretched and detected in turn, on the basis of the last time, and with the change of the arc surface, the adjusting sleeve 312 slowly rotates in the process of stretching the next group of rubber plastic pipe, which can more clearly and intuitively observe the morphological change of the rubber plastic pipe at the stretching limit. The detection of the performance of the rubber plastic pipe can be more stable.

[0047] In this embodiment, several elastic rebound devices 5 each include a bearing frame 51 fixedly connected to the bearing table 13, a notch 52 is formed in the bearing frame 51, a clamping disc 53 is arranged at the notch 52 of the bearing frame 51, and a movable clamping frame 54 is slidably connected to the notch 52 of the bearing frame 51, the movable clamping frame 54 is provided with a locking disc 55 for clamping the rubber plastic pipe, and the movable clamping frame 54 abuts against the end of the sliding rod 41;

[0048] A detection frame 56 is also slidably connected to the bearing frame 51, an elastic spring 57 is arranged between the detection frame 56 and the bearing frame 51, a wedge-shaped abutting block 58 is slidably connected in the detection frame 56, one side end face of the locking disc 55 is inclined and abuts against the wedge-shaped abutting block 58, and a notch is arranged on the detection frame 56 and abuts against the side of the locking disc 55 away from the inclined surface;

[0049] The rubber plastic pipe passes through the notch 52 in the bearing frame 51, one end of the rubber plastic pipe is fixed by the clamping disc 53, the other end of the rubber plastic pipe is fixed by the locking disc 55 in the notch 52, the end of the sliding rod 41 abuts against the movable clamping frame 54, so that the movable clamping frame 54 gradually moves the one end of the rubber plastic pipe in the notch 52 to stretch the rubber plastic pipe, in the process of moving the movable clamping frame 54, the inclined side of the locking disc 55 contacts the wedge-shaped abutting block 58, so that the wedge-shaped abutting block 58 is retracted, after the rubber plastic pipe is stretched, the operator disconnects the movable clamping frame 54 provided with the telescopic structure from the end of the sliding rod 41, and the rubber plastic pipe is retracted under the driving of its own elasticity, at this time, the end face of the locking disc 55 clamped on the rubber plastic pipe contacts the flat surface of the wedge-shaped abutting block 58, and then in the process of resetting the rubber plastic pipe, the locking disc 55 presses the flat surface of the wedge-shaped abutting block 58, at this time, the detection frame 56 slides on the bearing frame 51, and the distance of resetting and sliding of the detection frame 56 can determine whether the rebound rate of the rubber plastic pipe during resetting and rebounding can reach the standard value, i.e., less than or equal to 15%, so as to test the rebound performance of the rubber plastic pipe during resetting.

[0050] The use method and advantages of the present application are as follows: the rubber plastic pipe protection performance testing device has the following working process: ​As shown, the rotating motor 22 drives the cam 23 to rotate, and the clamping block 29 at the bottom of the lifting rod 25 slides in the groove 27 during the rotation of the cam 23. When the cam 23 rotates to the connecting groove 28 on the recessed surface, the lifting rod 25 is limited in the connecting groove 28, so that the clamping block 29 is deflected in the connecting groove 28 and moves towards the other groove 27, so that the clamping block 29 can move from one groove 27 to the other groove 27. The lifting rod 25 is movably connected to the moving plate 24, so that the moving plate 24 can slide on the mounting frame 21. The rotation of the cam 23 drives the lifting rod 25 through the groove 27 to make the moving plate 24 reciprocate, and the distance of each reciprocation of the moving plate 24 is the same. Therefore, when the rubber and plastic pipe on each bearing table 13 is subjected to the tension test, the initial value of the test piece 4 driven by the moving plate 24 is consistent.

[0051] The rotation of the cam 23 drives the lifting rod 25 to move the moving plate 24 towards the adjusting tooth plate 31 through the groove 27. At this time, the lifting ball 35 on the lifting rod 25 corresponds to the spherical cavity 34 on the adjusting tooth plate 31. With the rotation of the cam 23, the protruding end of the cam 23 will lift the lifting rod 25 upwards, and the lifting ball 35 will drive the adjusting tooth plate 31 to move upwards. When the adjusting tooth plate 31 moves upwards, it drives the adjusting gear 37 to rotate the rotating shaft 36 by 360 degrees. The rotating shaft 36 drives the intermittent rotating frame 38 to rotate by 360 degrees. The intermittent rotating frame 38 drives the intermittent disc 310 to rotate by 90 degrees through the intermittent groove 311 on the intermittent disc 310. The rotating shaft 39 on the intermittent disc 310 drives the adjusting sleeve 312 to rotate by 90 degrees. The pulley 318 on the initial flat end 313 of the adjusting sleeve 312 is driven by the compression spring 320 to move the adjusting frame 317 along the end surface of the adjusting sleeve 312. At this time, the pulley 318 moves from the initial flat end 313 to the first arc surface 314.

[0052] The adjusting sleeve 312 rotates by 90 degrees, and the pulley 318 is just stopped at the junction of the first arc surface 314 and the second arc surface 315. The pulley 318 drives the adjusting frame 317 to move forward under the action of the first arc surface 314. When the adjusting frame 317 moves, the adjusting pawl 45 on the adjusting frame 317 contacts the insertion gap between the arc-shaped inclined plate 42, so that the sliding rod 41 moves towards the elastic rebound device 5. The end of the sliding rod 41 is connected to the rubber and plastic pipe on the elastic rebound device 5, so as to stretch the rubber and plastic pipe on the elastic rebound device 5.

[0053] After the rubber and plastic pipe is stretched for testing, the rotating motor 22 drives the cam 23 to rotate, and the cam 23 drives the lifting rod 25 to move downwards. When the lifting rod 25 moves downwards, the adjusting tooth plate 31 returns to the original position. The one-way shaft in the adjusting gear 37 does not rotate the rotating shaft 36, and the intermittent rotating frame 38 on the rotating shaft 36 stops at the position of the last rotation.

[0054] When the cam 23 rotates to move the moving plate 24 forward again, the sliding rod 41 on the moving plate 24 moves on the basis of the last set of stretching tests, and the sliding rod 41 abuts against the corresponding elastic rebound device 5 to drive the rubber tube to stretch; when the jacking rod 25 moves the adjusting tooth plate 31 upward again, the upward movement of the adjusting tooth plate 31 drives the rotating shaft 39 to rotate 90 degrees again, and the pulley 318 on the second arc surface 315 of the adjusting sleeve 312 continues to move along the second arc surface 315; when the adjusting frame 317 moves through the adjusting pawl 45 arranged at the bottom to drive the sliding rod 41 to move forward, the stretching distance is extended again;

[0055] The end of the sliding rod 41 abuts against the moving clamping frame 54, so that the moving clamping frame 54 gradually moves one end of the rubber tube in the notch 52 to stretch it; during the movement of the moving clamping frame 54, the inclined surface of the locking disc 55 is in contact with the wedge-shaped abutting block 58, so that the wedge-shaped abutting block 58 is retracted; after the rubber tube is stretched, the operator disengages the moving clamping frame 54 arranged in a telescopic manner from the end of the sliding rod 41, and the rubber tube is retracted under the action of its own elasticity; at this time, the end surface of the locking disc 55 clamped on the rubber tube is in contact with the flat surface of the wedge-shaped abutting block 58, so that the locking disc 55 presses the flat surface of the wedge-shaped abutting block 58 during the resetting of the rubber tube; at this time, the detection frame 56 slides on the bearing frame 51, and the resetting distance of the detection frame 56 can be used to judge whether the rubber tube can meet the standard value in the resetting and rebounding process.

[0056] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A device for testing the protective performance of rubber and plastic pipes, comprising: a test table (1) provided with a screw sliding table (11) on the top, and a stretching test device (2) on the sliding table (12) of the screw sliding table (11); a plurality of bearing tables (13) equidistantly arranged on the top of the test table (1), and an elastic rebound device (5) arranged on each bearing table (13) for testing the rebound performance of the rubber and plastic pipe after stretching; the stretching test device (2) comprises a mounting frame (21), a rotating motor (22), a cam (23), a moving plate (24), a jacking rod (25) and a test piece (4); the mounting frame (21) is fixed on the sliding table (12) and internally provided with the rotating motor (22), and the main shaft of the rotating motor (22) is connected with the cam (23); the moving plate (24) is slidingly connected with the mounting frame (21), the jacking rod (25) is connected with the moving plate (24) through a connecting spring (26), and the bottom is provided with a clamping block (29) matched with a groove (27) on the surface of the cam (23); the test piece (4) is slidingly connected with the end of the moving plate (24) and used for abutting against the elastic rebound device (5) to stretch the rubber and plastic pipe; the mounting frame (21) is provided with an adjusting device (3), comprising: an adjusting toothed plate (31) slidingly connected with the side wall of the mounting frame (21) and provided with a spherical clamping cavity (34) on the top matched with a jacking ball (35) of the jacking rod (25); a rotating shaft (36) engaged with the adjusting toothed plate (31) through an adjusting gear (37), and a one-way bearing is arranged in the gear; an intermittent rotating frame (38) and an intermittent rotating disc (310) are drivingly matched, and the intermittent rotating disc (310) is connected with an adjusting sleeve (312) through a rotating shaft (39); the end surface of the adjusting sleeve (312) is provided with a first arc surface (314), a second arc surface (315) and a third arc surface (316) with decreasing arc rates, the end surface of the adjusting sleeve (312) abuts against a pulley (318) of an adjusting frame (317), and an adjusting pawl (45) is driven to push a sliding rod (41) of the test piece (4).

2. The device for testing the protective performance of an elastomer-plastic pipe according to claim 1, characterized in that: the test piece (4) comprises: the sliding rod (41) is provided with a plurality of arc-shaped inclined plates (42) on the surface and abuts against the elastic rebound device (5) at the end; a limiting pawl (43) connected with the moving plate (24) through a spring sheet (44) is used for locking the position of the sliding rod (41); the adjusting pawl (45) is matched with the arc-shaped inclined plate (42) and pushes the sliding rod (41) to gradually extend when the adjusting frame (317) moves.

3. The device for testing the protective performance of an elastomer-plastic pipe according to claim 1, characterized in that: the surface of the cam (23) is provided with two oppositely arranged grooves (27), and the two grooves (27) form an X-shaped connecting groove (28) on the concave surface of the cam, the clamping block (29) slides along the groove (27) and is switched to another groove (27) through the connecting groove (28) when the cam rotates, and the moving plate (24) is driven to reciprocatingly slide.

4. The device for testing the protective performance of an elastomer-plastic pipe according to claim 1, characterized in that: the elastic rebound device (5) comprises: a bearing frame (51) provided with a slot (52) and a fixed clamping disc (53); a moving clamping frame (54) slidingly connected in the slot (52) and provided with a locking disc (55) for fixing the end of the rubber and plastic pipe. The detection frame (56) is connected with the bearing frame (51) through the elastic spring (57), is internally provided with the wedge-shaped abutting block (58) and the locking disc (55) and is used for detecting the rebound displacement of the rubber and plastic pipe.

5. A device for testing the protective properties of a rubber or plastic tube according to claim 4, characterized in that: One side of the locking disc (55) is a slope, and the other side is a plane, which correspond to the contraction of the wedge-shaped abutting block (58) during stretching and the sliding of the detection frame (56) during rebounding, respectively.

6. The device of claim 1, wherein: The first arc surface (314), the second arc surface (315) and the third arc surface (316) of the end face of the adjusting sleeve (312) are isometrically reduced in arc rate, each rotation of 90 degrees switches the arc surface, and the stretching distance gradient of the sliding rod (41) is increased.

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